Quick questions on Pitch and staff notation explained: O-Level Music

The treble clef (G clef) curls around the second line from the bottom, marking it as the G above middle C. From there you can name everything:

The bass clef (F clef) has two dots that sit above and below the fourth line from the bottom, marking it as the F below middle C.

An accidental alters a note within a bar. A sharp raises a note by a semitone, a flat lowers it by a semitone, and a natural cancels a previous sharp or flat. An accidental lasts only to the end of the bar in which it appears.

Notes of the same letter an octave apart sound alike but at different heights. A useful labelling system calls middle C the note $C_4$, the C an octave higher $C_5$, and the C an octave lower $C_3$, so a register can be named precisely.

State the pitch that the treble clef and the bass clef each fix, and explain why this matters. [3 marks]

Describe what a sharp, a flat and a natural each do to a note. [3 marks]

Explain where middle C is written on the treble and bass staves and why it is important. [2 marks]